JP5282003B2 - Exhaust gas recirculation device - Google Patents

Exhaust gas recirculation device Download PDF

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JP5282003B2
JP5282003B2 JP2009235917A JP2009235917A JP5282003B2 JP 5282003 B2 JP5282003 B2 JP 5282003B2 JP 2009235917 A JP2009235917 A JP 2009235917A JP 2009235917 A JP2009235917 A JP 2009235917A JP 5282003 B2 JP5282003 B2 JP 5282003B2
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egr gas
cooling water
egr
housing
passage
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JP2011085017A (en
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英治 西島
光規 村上
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Honda Motor Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Description

本発明は、水冷式のＥＧＲクーラを備えた排気ガス再循環装置に係り、詳しくはＥＧＲクーラ内におけるエンジン冷却水のボイリングの抑制を図る技術に関する。   The present invention relates to an exhaust gas recirculation device provided with a water-cooled EGR cooler, and more particularly to a technique for suppressing engine cooling water boiling in the EGR cooler.

ガソリンエンジンやディーゼルエンジンでは、燃費の向上や有害排出ガス成分（排気ＥＭ）の低減を図るべく、排気ガスの一部をＥＧＲガスとして排気系から燃焼室に再循環させる排気ガス再循環（Exhaust Gas Recirculation：以下、ＥＧＲと記す）装置が広く採用されている。ＥＧＲガスは、高温のままで燃焼室に環流させると燃焼温度が上昇してＮＯｘの排出量が増加することから、その一部あるいは全部を水冷式のＥＧＲクーラによって冷却することで低温ＥＧＲガスとした後に環流させることが望ましい。ＥＧＲクーラとしては、ＥＧＲガスの流入路および流出路とエンジン冷却水の導入口および排出口とを有するハウジングと、ハウジングに内装されてＥＧＲガスの通過に供されるインナチューブとを備えたものが一般的である（特許文献１参照）。   In gasoline and diesel engines, exhaust gas recirculation (exhaust gas) is used to recirculate part of the exhaust gas from the exhaust system to the combustion chamber as EGR gas in order to improve fuel economy and reduce harmful exhaust gas components (exhaust EM). Recirculation (hereinafter referred to as EGR) devices are widely adopted. When EGR gas is recirculated to the combustion chamber at a high temperature, the combustion temperature rises and the amount of NOx emissions increases. Therefore, by cooling part or all of the EGR gas with a water-cooled EGR cooler, It is desirable to reflux after the operation. An EGR cooler includes a housing having an EGR gas inlet and outlet passage, an engine cooling water inlet and outlet, and an inner tube that is built in the housing and is used for passage of EGR gas. It is general (refer patent document 1).

特許第４０３５６５１号公報Japanese Patent No. 4035651

近年、ディーゼルエンジン等においては、排気ＥＭの更なる低減を図るべく大量のＥＧＲガスを再循環させる傾向にあり、冷却能力が大きい大容量のＥＧＲクーラが採用されることが多くなっている。ところが、大容量のＥＧＲクーラでは、エンジン冷却水の導入口や排出口から離れた部位において、高熱負荷時等にＥＧＲガスの熱が吸収しきれなくなり、ハウジング内でエンジン冷却水のボイリング（沸騰）が発生することがあった。そして、エンジン冷却水のボイリングは、ＥＧＲクーラの冷却能力を著しく低下させ、燃費の向上や排気ＥＭの低減を阻害する要因となるため、その抑制が強く望まれていた。   In recent years, diesel engines and the like tend to recirculate a large amount of EGR gas in order to further reduce the exhaust EM, and a large-capacity EGR cooler having a large cooling capacity is often employed. However, in a large-capacity EGR cooler, the heat of the EGR gas cannot be absorbed at a high heat load or the like at a part away from the inlet and outlet of the engine cooling water, and the engine cooling water is boiling (boiling) in the housing. May occur. And since the engine cooling water boiler significantly reduces the cooling capacity of the EGR cooler and hinders the improvement of fuel consumption and the reduction of exhaust EM, the suppression thereof has been strongly desired.

本発明は、このような背景に鑑みなされたもので、ＥＧＲクーラ内におけるエンジン冷却水のボイリングの抑制を図った排気ガス再循環装置を提供することを目的とする。   The present invention has been made in view of such a background, and an object of the present invention is to provide an exhaust gas recirculation device that suppresses boiling of engine coolant in an EGR cooler.

第１の発明は、内燃機関に付設され、排気ガスの一部をＥＧＲガスとして排気系から吸気系に環流させる排気ガス再循環装置であって、それぞれ複数のＥＧＲガス通路および冷却水通路がその内部に形成されたハウジングと、前記ＥＧＲガス通路にＥＧＲガスを流入させるＥＧＲガス流入路と、前記冷却水通路にエンジン冷却水を導入する冷却水導入管と、前記冷却水通路からエンジン冷却水を排出する冷却水排出管とを有し、当該ＥＧＲガスを当該エンジン冷却水によって冷却するＥＧＲクーラを備え、前記複数のＥＧＲガス通路は、前記ハウジング内で一方向に所定の間隔をもって並べられた複数のインナチューブにより形成され、前記ＥＧＲガス流入路は、前記ハウジングの前記ＥＧＲガス通路の上流側となる所定部位に接続されかつ前記複数のインナチューブの前記並び方向に対して前記ＥＧＲガスを偏って流入させるように湾曲しており、前記冷却水導入管は、前記ハウジングの前記ＥＧＲガスの流れ方向下流側となる部位に接続され、前記冷却水排出管は、冷却水が前記ハウジング内で前記複数のインナチューブのそれぞれの間を前記ＥＧＲガスの流れとは相反する方向に流れかつ前記所定部位の側で前記複数のインナチューブの並び方向と直交する方向に流れるように、前記ハウジングのＥＧＲガスの流れ方向上流側となる部位で接続されることを特徴とする。 A first invention is an exhaust gas recirculation device attached to an internal combustion engine and circulating a part of exhaust gas as EGR gas from an exhaust system to an intake system, each of which has a plurality of EGR gas passages and cooling water passages. A housing formed inside, an EGR gas inflow passage for allowing EGR gas to flow into the EGR gas passage, a cooling water introduction pipe for introducing engine cooling water into the cooling water passage, and engine cooling water from the cooling water passage. A plurality of EGR gas passages that are arranged at a predetermined interval in one direction in the housing. The EGR cooler includes an EGR cooler that cools the EGR gas with the engine coolant. is formed by the inner tube, the EGR gas inlet passage is connected to a predetermined portion on the upstream side of the EGR gas passage of the housing and Serial is curved so that with respect to the arrangement direction of the plurality of inner tubes is flowed disproportionately the EGR gas, the cooling water inlet pipe is connected to a site where the flow direction downstream side of the EGR gas in the housing The cooling water discharge pipe is configured such that the cooling water flows between each of the plurality of inner tubes in the housing in a direction opposite to the flow of the EGR gas and the plurality of inner tubes on the predetermined portion side. to flow in a direction to the arrangement direction orthogonal are connected in part to be the flow direction upstream side of the EGR gas in the housing, characterized in Rukoto.

また、第２の発明は、第１の発明に係る排気ガス再循環装置において、前記偏流手段が前記ＥＧＲガス流入路の湾曲であることを特徴とする。   According to a second aspect of the present invention, in the exhaust gas recirculation device according to the first aspect of the present invention, the drifting means is a curve of the EGR gas inflow passage.

また、第３の発明は、第１または第２の発明に係る排気ガス再循環装置において、前記ＥＧＲガス通路は、前記ハウジング内で一方向に並べられた複数のインナチューブにより形成され、前記冷却水導入管と前記冷却水排出管とのどちらか一方は、前記インナチューブの並び方向と直交する方向で前記冷却水通路に接続することを特徴とする。   According to a third aspect of the present invention, in the exhaust gas recirculation device according to the first or second aspect of the present invention, the EGR gas passage is formed by a plurality of inner tubes arranged in one direction in the housing. One of the water introduction pipe and the cooling water discharge pipe is connected to the cooling water passage in a direction orthogonal to the arrangement direction of the inner tubes.

第１の発明によれば、ＥＧＲガス流入路のうちでＥＧＲガスが多く流れる部位に冷却水導入管や冷却水排出管が接続するため、多量のＥＧＲガスと高い流速のエンジン冷却水との間で熱交換が行われることになり、高熱負荷時等においてもＥＧＲガスの熱がエンジン冷却水に吸収しきれなくなる事態が生じにくくなり、ハウジング内でのエンジン冷却水のボイリングが効果的に抑制される。また、第２の発明によれば、ハウジング内に偏流板等を付加することなく、ハウジング内にＥＧＲガスを偏って流入させることが可能となる。また、第３の発明によれば、ハウジング内でのエンジン冷却水の流れがインナチューブの壁面によって阻害されにくくなり、所定部位における熱交換が円滑に行われるようになる。   According to the first aspect of the invention, since the cooling water introduction pipe and the cooling water discharge pipe are connected to the portion where the EGR gas flows in the EGR gas inflow passage, the gap between the large amount of EGR gas and the high-speed engine cooling water. The heat exchange is performed in this way, and it becomes difficult for the EGR gas heat to be absorbed into the engine cooling water even under high heat loads, and the engine cooling water boiling in the housing is effectively suppressed. The In addition, according to the second invention, it is possible to cause the EGR gas to flow in a biased manner in the housing without adding a drift plate or the like in the housing. Further, according to the third aspect of the invention, the flow of engine cooling water in the housing is less likely to be hindered by the wall surface of the inner tube, and heat exchange at a predetermined portion is smoothly performed.

実施形態に係るＥＧＲ装置を示す側面図である。It is a side view which shows the EGR apparatus which concerns on embodiment. 実施形態に係るＥＧＲクーラを示す平面図である。It is a top view which shows the EGR cooler which concerns on embodiment. 図２中のIII−III拡大断面図である。It is the III-III expanded sectional view in FIG. ＥＧＲクーラ内でのＥＧＲガスおよびエンジン冷却水の流れを示す図である。It is a figure which shows the flow of EGR gas and engine cooling water in an EGR cooler.

以下、図面を参照して、本発明をディーゼルエンジン用のＥＧＲ装置に適用した一実施形態を詳細に説明する。なお、実施形態では、説明の便宜上、図１における右側を前方とし、紙面手前側を右方（反エンジン側）とする。   Hereinafter, an embodiment in which the present invention is applied to an EGR device for a diesel engine will be described in detail with reference to the drawings. In the embodiment, for convenience of explanation, the right side in FIG. 1 is the front side, and the front side of the drawing is the right side (the anti-engine side).

≪実施形態の構成≫
図１に示すように、ＥＧＲ装置１は、上流側分岐管２、ＥＧＲクーラ３、バイパスパイプ４、ＥＧＲバイパスバルブ５を主要な構成要素としている。上流側分岐管２は、排気管（図示せず）から分岐した排気分流管８に接続し、排気分流管８から流入したＥＧＲガスをＥＧＲクーラ３とバイパスパイプ４とに分配する。ＥＧＲクーラ３は、上流側分岐管２から流入したＥＧＲガスをエンジン冷却水によって冷却し、低温ＥＧＲガスとしてＥＧＲバイパスバルブ５に供給する。バイパスパイプ４は、上流側分岐管２から流入したＥＧＲガスを高温ＥＧＲガスとしてそのままＥＧＲバイパスバルブ５に供給する。ＥＧＲバイパスバルブ５は、図示しないエンジンＥＣＵの駆動指令に基づいて作動し、低温ＥＧＲガスあるいは高温ＥＧＲガスを吸気系のＥＧＲガス環流管９に選択的に供給する。 << Configuration of Embodiment >>
As shown in FIG. 1, the EGR device 1 includes an upstream branch pipe 2, an EGR cooler 3, a bypass pipe 4, and an EGR bypass valve 5 as main components. The upstream branch pipe 2 is connected to an exhaust branch pipe 8 branched from an exhaust pipe (not shown), and distributes the EGR gas flowing from the exhaust branch pipe 8 to the EGR cooler 3 and the bypass pipe 4. The EGR cooler 3 cools the EGR gas flowing in from the upstream branch pipe 2 with engine cooling water, and supplies the EGR gas to the EGR bypass valve 5 as low-temperature EGR gas. The bypass pipe 4 supplies the EGR gas flowing in from the upstream branch pipe 2 to the EGR bypass valve 5 as it is as a high temperature EGR gas. The EGR bypass valve 5 operates based on a drive command from an engine ECU (not shown), and selectively supplies low-temperature EGR gas or high-temperature EGR gas to the EGR gas circulation pipe 9 of the intake system.

上流側分岐管２は、ＥＧＲクーラ３に接続するクーラ側接続パイプ１１と、バイパスパイプ４に接続するバイパス側接続パイプ１２とを有している。図２にも示すように、クーラ側接続パイプ１１は湾曲しており、排気分流管８から左方に向けて流入したＥＧＲガスを略９０°屈曲させて後方のＥＧＲクーラ３に流入させる。   The upstream side branch pipe 2 has a cooler side connection pipe 11 connected to the EGR cooler 3 and a bypass side connection pipe 12 connected to the bypass pipe 4. As shown in FIG. 2, the cooler-side connection pipe 11 is curved, and the EGR gas that flows in the left direction from the exhaust gas distribution pipe 8 is bent by approximately 90 ° and flows into the rear EGR cooler 3.

＜ＥＧＲクーラ＞
図１，図２に示すように、ＥＧＲクーラ３は、直方体形状を呈するハウジング２１と、ハウジング２１の後端（上流端）に形成された上流側コーン部２２と、ハウジング２１の前端（下流端）に形成された下流側コーン部２３と、冷却水導入ホース２４が接続する冷却水導入パイプ２５と、冷却水排出ホース２６が接続する冷却水排出パイプ２７と、バルブ冷却ホース２８が接続するバルブ冷却パイプ２９とを有している。なお、バルブ冷却パイプ２９は、遮熱板を兼ねたパイプブラケット３０を介し、ハウジング２１の下面に支持されている。本実施形態の場合、冷却水導入パイプ２５および冷却水排出パイプ２７はどちらもハウジング２１の上面に接続しているが、冷却水導入パイプ２５はハウジング２１の前端側右方に位置し、冷却水排出パイプ２７はハウジング２１の後端側左方に位置している。すなわち、冷却水導入パイプ２５と冷却水排出パイプ２７とは、ハウジング２１に対して平面視で対角線Ｌ上に位置している。 <EGR cooler>
As shown in FIGS. 1 and 2, the EGR cooler 3 includes a housing 21 having a rectangular parallelepiped shape, an upstream cone portion 22 formed at a rear end (upstream end) of the housing 21, and a front end (downstream end) of the housing 21. ) Formed in the downstream cone portion 23, a cooling water introduction pipe 25 connected to the cooling water introduction hose 24, a cooling water discharge pipe 27 connected to the cooling water discharge hose 26, and a valve connected to the valve cooling hose 28. And a cooling pipe 29. The valve cooling pipe 29 is supported on the lower surface of the housing 21 via a pipe bracket 30 that also serves as a heat shield. In the present embodiment, the cooling water introduction pipe 25 and the cooling water discharge pipe 27 are both connected to the upper surface of the housing 21, but the cooling water introduction pipe 25 is located on the right side of the front end side of the housing 21, The discharge pipe 27 is located on the left side of the rear end side of the housing 21. That is, the cooling water introduction pipe 25 and the cooling water discharge pipe 27 are located on the diagonal line L in plan view with respect to the housing 21.

図３に示すように、本実施形態のハウジング２１には、ＥＧＲガス通路となる扁平なインナチューブ３４が左右方向に所定の間隔をもって複数列（図示例では、７列）形成されており、上流側コーン部２２から流入したＥＧＲガスがこれらインナチューブ３４を通過する。インナチューブ３４の上端側にはエンジン冷却水が貯留されるアッパタンク３１が形成される一方で、下端側にロアタンク３２が形成され、ハウジング２１の内壁やインナチューブ３４の壁面によって画成される空間が両タンク３１，３２を連通する冷却水通路３３となっている。そして、上述した冷却水排出パイプ２７は、冷却水通路３３の並び方向（左右方向）と直交する方向（すなわち、上下方向）でハウジング２１の上面に開口している。   As shown in FIG. 3, in the housing 21 of the present embodiment, flat inner tubes 34 serving as EGR gas passages are formed in a plurality of rows (seven rows in the illustrated example) at predetermined intervals in the left-right direction. EGR gas flowing in from the side cone portion 22 passes through these inner tubes 34. An upper tank 31 for storing engine cooling water is formed on the upper end side of the inner tube 34, while a lower tank 32 is formed on the lower end side, and a space defined by the inner wall of the housing 21 and the wall surface of the inner tube 34 is formed. A cooling water passage 33 communicates the tanks 31 and 32. The cooling water discharge pipe 27 described above is opened on the upper surface of the housing 21 in a direction (that is, the vertical direction) orthogonal to the direction in which the cooling water passages 33 are arranged (left and right direction).

≪実施形態の作用≫
エンジンが運転を開始すると、エンジンＥＣＵは、エンジン回転速度や冷却水温、吸気温、エンジン負荷等の各種運転情報に基づいてＥＧＲガスの環流量や導入温度を設定し、ＥＧＲバイパスバルブ５を駆動制御する。ＥＧＲバイパスバルブ５は、クーラポジションにおいてＥＧＲクーラ３からの低温ＥＧＲガスをＥＧＲガス環流管９に流し、バイパスポジションにおいてバイパスパイプ４からの高温ＥＧＲガスをＥＧＲガス環流管９に流す。なお、ＥＧＲガスの供給を停止もしくは流量調整する際には、図示しないＥＧＲバルブの開閉制御あるいは開度制御を行う。 << Operation of Embodiment >>
When the engine starts operation, the engine ECU sets the EGR gas circulation flow rate and the introduction temperature based on various operation information such as the engine rotation speed, the cooling water temperature, the intake air temperature, and the engine load, and drives and controls the EGR bypass valve 5. To do. The EGR bypass valve 5 allows the low temperature EGR gas from the EGR cooler 3 to flow to the EGR gas recirculation pipe 9 at the cooler position, and allows the high temperature EGR gas from the bypass pipe 4 to flow to the EGR gas recirculation pipe 9 at the bypass position. When the supply of EGR gas is stopped or the flow rate is adjusted, opening / closing control or opening degree control of an EGR valve (not shown) is performed.

ＥＧＲバイパスバルブ５のクーラポジションでＥＧＲクーラ３に流入したＥＧＲガスは、冷却水通路３３内を通過するエンジン冷却水と熱交換を行うことで低温ＥＧＲガスとなった後、ＥＧＲバイパスバルブ５およびＥＧＲガス環流管９を介して燃焼室に環流する。この際、図４に示すように、ＥＧＲガスは、クーラ側接続パイプ１１によって略９０°屈曲させられるため、左方に偏った状態で上流側コーン部２２からハウジング２１内に流入する（すなわち、左側のインナチューブ３４により多く流入する）。一方、図３に示すように、ハウジング２１の後端側では、冷却水排出パイプ２７が左上方に位置するため、エンジン冷却水も左側の冷却水通路３３により多く流れる（すなわち、左側の冷却水通路３３内でエンジン冷却水の流速が高くなる）。   The EGR gas that has flowed into the EGR cooler 3 at the cooler position of the EGR bypass valve 5 becomes low-temperature EGR gas by exchanging heat with the engine coolant passing through the cooling water passage 33, and then the EGR bypass valve 5 and the EGR It circulates to the combustion chamber via the gas recirculation pipe 9. At this time, as shown in FIG. 4, since the EGR gas is bent by approximately 90 ° by the cooler side connection pipe 11, the EGR gas flows into the housing 21 from the upstream cone portion 22 in a state biased to the left (that is, More flows into the left inner tube 34). On the other hand, as shown in FIG. 3, at the rear end side of the housing 21, the cooling water discharge pipe 27 is located on the upper left side, so that a lot of engine cooling water flows through the left cooling water passage 33 (that is, the left cooling water). The flow rate of engine cooling water increases in the passage 33).

このように、ハウジング２１内では、多量のＥＧＲガスと高い流速のエンジン冷却水とがどちらも左側を流れることになり、該部においてインナチューブ３４を隔てて出会ったＥＧＲガスとエンジン冷却水との間で効果的に熱交換が行われる。なお、冷却水排出パイプ２７が冷却水通路３３の並び方向と直交する方向で接続しているため、冷却水排出パイプ２７に流入するエンジン冷却水の流れが冷却水通路３３の壁面によって阻害されず、左側の冷却水通路３３におけるＥＧＲガスとエンジン冷却水との熱交換効率が向上する。これらにより、本実施形態では、高熱負荷時等においてもＥＧＲガスの熱がエンジン冷却水に吸収されやすくなり、クーラコア内でのエンジン冷却水のボイリングが効果的に抑制される。   Thus, in the housing 21, both a large amount of EGR gas and a high flow rate engine cooling water flow on the left side, and the EGR gas and the engine cooling water that meet with each other across the inner tube 34 in this portion. Heat exchange between them. Since the cooling water discharge pipe 27 is connected in a direction orthogonal to the direction in which the cooling water passages 33 are arranged, the flow of engine cooling water flowing into the cooling water discharge pipe 27 is not hindered by the wall surface of the cooling water passage 33. The heat exchange efficiency between the EGR gas and the engine coolant in the left coolant passage 33 is improved. As a result, in the present embodiment, the heat of the EGR gas is easily absorbed by the engine cooling water even during a high heat load or the like, and the boiling of the engine cooling water in the cooler core is effectively suppressed.

以上で具体的実施形態の説明を終えるが、本発明はこれら実施形態に限定されることなく幅広く変形実施することができる。例えば、上記実施形態はディーゼルエンジンのＥＧＲ装置に本発明を適用したものであるが、本発明はガソリンエンジン等のＥＧＲ装置にも当然に採用可能である。また、上記実施形態では、偏流手段としてＥＧＲガス流入路の湾曲を採用したが、偏流手段としてハウジング内に偏流板を設けるようにしてもよい。また、上記実施形態では、冷却水通路に対して所定部位で冷却水排出管を接続させるようにしたが、冷却水排出管に代えて冷却水導入管を接続させるようにしてもよく、この場合にも略同様の効果を得ることができる。その他、ＥＧＲ装置の具体的構成等についても、本発明の趣旨を逸脱しない範囲であれば適宜変更可能である。   Although the description of the specific embodiments is finished as described above, the present invention is not limited to these embodiments and can be widely modified. For example, in the above-described embodiment, the present invention is applied to an EGR device for a diesel engine, but the present invention can naturally be applied to an EGR device such as a gasoline engine. Moreover, in the said embodiment, although the curve of the EGR gas inflow path was employ | adopted as a drifting means, you may make it provide a drifting plate in a housing as a drifting means. In the above embodiment, the cooling water discharge pipe is connected to the cooling water passage at a predetermined position. However, instead of the cooling water discharge pipe, a cooling water introduction pipe may be connected. In addition, substantially the same effect can be obtained. In addition, the specific configuration and the like of the EGR device can be appropriately changed as long as they do not depart from the spirit of the present invention.

１ ＥＧＲ装置
２ 上流側分岐管
３ ＥＧＲクーラ
１１ クーラ側接続パイプ（ＥＧＲガス流入路、偏流手段）
２１ ハウジング
２２ 上流側コーン部
２５ 冷却水導入パイプ（冷却水導入管）
２７ 冷却水排出パイプ（冷却水排出管）
３１ アッパタンク
３２ ロアタンク
３３ 冷却水通路
３４ インナチューブ（ＥＧＲガス通路） DESCRIPTION OF SYMBOLS 1 EGR apparatus 2 Upstream branch pipe 3 EGR cooler 11 Cooler side connection pipe (EGR gas inflow path, drifting means)
21 Housing 22 Upstream cone part 25 Cooling water introduction pipe (cooling water introduction pipe)
27 Cooling water discharge pipe (cooling water discharge pipe)
31 Upper tank 32 Lower tank 33 Cooling water passage 34 Inner tube (EGR gas passage)

Claims (4)

内燃機関に付設され、排気ガスの一部をＥＧＲガスとして排気系から吸気系に環流させる排気ガス再循環装置であって、
それぞれ複数のＥＧＲガス通路および冷却水通路がその内部に形成されたハウジングと、前記ＥＧＲガス通路にＥＧＲガスを流入させるＥＧＲガス流入路と、前記冷却水通路にエンジン冷却水を導入する冷却水導入管と、前記冷却水通路からエンジン冷却水を排出する冷却水排出管とを有し、当該ＥＧＲガスを当該エンジン冷却水によって冷却するＥＧＲクーラを備え、
前記複数のＥＧＲガス通路は、前記ハウジング内で前記ＥＧＲガスの流れを横切る方向に所定の間隔をもって並べられた複数のインナチューブにより形成され、
前記ＥＧＲガス流入路は、前記ハウジングの前記ＥＧＲガス通路の上流側となる所定部位に接続されかつ前記複数のインナチューブの前記並び方向に対して前記ＥＧＲガスを偏って流入させるように湾曲しており、
前記冷却水導入管は、前記ハウジングの前記ＥＧＲガスの流れ方向下流側となる部位に接続され、
前記冷却水排出管は、前記ハウジングのＥＧＲガスの流れ方向上流側の前記ＥＧＲガスが偏って多量に流入する側に、かつ前記複数のインナチューブの並び方向及び前記ＥＧＲガスの流れ方向と直交する方向に冷却水を流すように接続されることを特徴とする排気ガス再循環装置。 An exhaust gas recirculation device attached to an internal combustion engine for recirculating a part of exhaust gas from an exhaust system to an intake system as EGR gas,
A housing in which a plurality of EGR gas passages and cooling water passages are formed, an EGR gas inflow passage through which EGR gas flows into the EGR gas passage, and cooling water introduction for introducing engine cooling water into the cooling water passage A cooling water discharge pipe for discharging engine cooling water from the cooling water passage, and an EGR cooler for cooling the EGR gas with the engine cooling water,
The plurality of EGR gas passages are formed by a plurality of inner tubes arranged at a predetermined interval in a direction crossing the flow of the EGR gas in the housing.
The EGR gas inlet passage is curved so as to flow into biased the EGR gas to the array direction of the is connected to a predetermined portion on the upstream side of the EGR gas passage and said plurality of inner tubes of said housing And
The cooling water introduction pipe is connected to a portion on the downstream side in the flow direction of the EGR gas of the housing,
The cooling water discharge pipe is on the upstream side of the EGR gas in the EGR gas flow direction of the housing and on the side where a large amount of the EGR gas flows in a direction, and is orthogonal to the arrangement direction of the plurality of inner tubes and the flow direction of the EGR gas. exhaust gas recirculation device according to claim Rukoto connected to flow a cooling water in the direction. 内燃機関に付設され、排気ガスの一部をＥＧＲガスとして排気系から吸気系に環流させる排気ガス再循環装置であって、
それぞれ複数のＥＧＲガス通路および冷却水通路がその内部に形成されたハウジングと、前記ＥＧＲガス通路にＥＧＲガスを流入させるＥＧＲガス流入路と、前記冷却水通路にエンジン冷却水を導入する冷却水導入管と、前記冷却水通路からエンジン冷却水を排出する冷却水排出管とを有し、当該ＥＧＲガスを当該エンジン冷却水によって冷却するＥＧＲクーラを備え、
前記ＥＧＲガス流入路は、前記ハウジングの前記ＥＧＲガス通路の上流側となる所定部位に接続されかつ前記複数のＥＧＲガス通路に前記ＥＧＲガスを偏って流入させる偏流手段を有し、
前記冷却水導入管は、前記ハウジングの前記ＥＧＲガスの流れ方向下流側となる部位に接続され、
前記冷却水排出管は、冷却水が前記ハウジング内で前記ＥＧＲガスの流れとは相反する方向に流れるように前記所定部位の側で前記ハウジングのＥＧＲガスの流れ方向上流側となる部位で接続されることを特徴とする排気ガス再循環装置。 An exhaust gas recirculation device attached to an internal combustion engine for recirculating a part of exhaust gas from an exhaust system to an intake system as EGR gas,
A housing in which a plurality of EGR gas passages and cooling water passages are formed, an EGR gas inflow passage through which EGR gas flows into the EGR gas passage, and cooling water introduction for introducing engine cooling water into the cooling water passage A cooling water discharge pipe for discharging engine cooling water from the cooling water passage, and an EGR cooler for cooling the EGR gas with the engine cooling water,
The EGR gas inflow path is connected to a predetermined portion on the upstream side of the EGR gas passage of the housing , and has a drifting means for biasing the EGR gas into the plurality of EGR gas passages,
The cooling water introduction pipe is connected to a portion on the downstream side in the flow direction of the EGR gas of the housing,
The cooling water discharge pipe is connected at a portion on the upstream side in the EGR gas flow direction of the housing on the predetermined portion side so that the cooling water flows in a direction opposite to the flow of the EGR gas in the housing. An exhaust gas recirculation device characterized by that. 前記偏流手段が前記ＥＧＲガス流入路の湾曲であることを特徴とする、請求項２に記載された排気ガス再循環装置。 The exhaust gas recirculation device according to claim 2 , wherein the drifting means is a curve of the EGR gas inflow path. 前記ＥＧＲガス通路は、前記ハウジング内で前記ＥＧＲガスの流れを横切る方向に所定の間隔をもって並べられた複数のインナチューブにより形成され、
前記冷却水排出管は、前記インナチューブの並び方向及び前記ＥＧＲガスの流れ方向と直交する方向に冷却水を流すように前記冷却水通路に接続することを特徴とする、請求項２または請求項３に記載された排気ガス再循環装置。 The EGR gas passage is formed by a plurality of inner tubes arranged at a predetermined interval in a direction across the flow of the EGR gas in the housing,
The cooling water discharge pipe, characterized in that said connecting to the cooling water passage to flow a cooling water arrangement direction and the direction perpendicular to the flow direction of the EGR gas in the inner tube, according to claim 2 or claim 3. The exhaust gas recirculation device according to 3.
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